Six-Port Circuit Frequency Measurement with Interference Detection
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Solution Overview
Problem
Existing electrical measuring systems face challenges in precision and interference detection, particularly in accurately measuring signal frequencies and detecting interference signals in the presence of noise, which affects their operation and coexistence with other systems on the same frequency band.
Innovation Solution
The system employs a six-port circuit with a delay line and an arithmetic unit that operates in two modes: one for signal frequency measurement and another for interference detection, where a reference signal is used to identify interference signals, allowing for precise detection and adjustment of the system's operation to minimize interference and ensure coexistence with other systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring system continuously transmits signals to the first input terminal for frequency measurement, then measurement precision is maintained, but interference signals from other systems increase
Solution Approach 1:
The system implements periodic interference detection by switching to the second operating mode at regular intervals. During these intervals, the signal transmission to the first input terminal is suspended and a reference signal is transmitted instead, allowing the arithmetic unit to detect interference signals without the contamination of the measurement signal itself
Solution Approach 2:
The system performs interference detection in advance by periodically checking for interference signals before resuming frequency measurements. This preliminary detection allows the system to identify and account for interference signals that may affect upcoming measurements, enabling better measurement planning and interference mitigation
2Measurement precision
If the system switches to second operating mode for interference detection, then interference signal detection capability is improved, but measurement productivity decreases
Solution Approach 1:
The system performs interference detection partially by using only the necessary second operating mode intervals rather than continuous detection. The detection is sufficient to identify interference signals without requiring excessive time, maintaining a balance between detection capability and measurement productivity
Solution Approach 2:
The system changes operational parameters by switching between two distinct operating modes. The second operating mode uses a reference signal with specific characteristics that enable interference detection, while the first operating mode uses the measurement signal for frequency determination. This parameter change allows the same hardware to perform both functions effectively
3Device complexity
If the system uses inherent signals for measurement, then measurement function is simplified, but interference with other systems increases
Solution Approach 1:
The system extracts and separates the interference detection function from the measurement function. By using a dedicated second operating mode with reference signal transmission, the system can detect interference signals without relying on the measurement signal itself, thereby reducing interference to other systems while maintaining measurement capability
Data Source
AI summary
An electrical measuring system of a six-port circuit includes a delay line and a arithmetic unit. In a first operating mode, an electrical signal can be on the one hand transmitted directly to a first input terminal and on the other hand via the delay line to a second input terminal of the six-port circuit. In an embodiment, the measuring system is configured such that, in the second operating mode, it does not supply a signal to the first input terminal of the six-port circuit and it supplies a reference signal to the second input terminal of the six-port circuit.